from abc import ABC, abstractmethod

# enum EDIT_TYPE (ADDED, DELETED, MODIFIED, RENAMED)
from typing import Optional

from pr_agent.config_loader import get_settings
from pr_agent.algo.types import FilePatchInfo
from pr_agent.log import get_logger


class GitProvider(ABC):
    @abstractmethod
    def is_supported(self, capability: str) -> bool:
        pass

    @abstractmethod
    def get_diff_files(self) -> list[FilePatchInfo]:
        pass

    @abstractmethod
    def publish_description(self, pr_title: str, pr_body: str):
        pass

    @abstractmethod
    def publish_code_suggestions(self, code_suggestions: list) -> bool:
        pass

    @abstractmethod
    def get_languages(self):
        pass

    @abstractmethod
    def get_pr_branch(self):
        pass

    @abstractmethod
    def get_user_id(self):
        pass

    @abstractmethod
    def get_pr_description_full(self) -> str:
        pass

    def edit_comment(self, comment, body: str):
        pass

    def reply_to_comment_from_comment_id(self, comment_id: int, body: str):
        pass

    def get_pr_description(self, *, full: bool = True) -> str:
        from pr_agent.config_loader import get_settings
        from pr_agent.algo.utils import clip_tokens
        max_tokens_description = get_settings().get("CONFIG.MAX_DESCRIPTION_TOKENS", None)
        description = self.get_pr_description_full() if full else self.get_user_description()
        if max_tokens_description:
            return clip_tokens(description, max_tokens_description)
        return description

    def get_user_description(self) -> str:
        if hasattr(self, 'user_description') and not (self.user_description is None):
            return self.user_description

        description = (self.get_pr_description_full() or "").strip()
        description_lowercase = description.lower()
        get_logger().debug(f"Existing description", description=description_lowercase)

        # if the existing description wasn't generated by the pr-agent, just return it as-is
        if not self._is_generated_by_pr_agent(description_lowercase):
            get_logger().info(f"Existing description was not generated by the pr-agent")
            return description

        # if the existing description was generated by the pr-agent, but it doesn't contain a user description,
        # return nothing (empty string) because it means there is no user description
        user_description_header = "### **user description**"
        if user_description_header not in description_lowercase:
            get_logger().info(f"Existing description was generated by the pr-agent, but it doesn't contain a user description")
            return ""

        # otherwise, extract the original user description from the existing pr-agent description and return it
        # user_description_start_position = description_lowercase.find(user_description_header) + len(user_description_header)
        # return description[user_description_start_position:].split("\n", 1)[-1].strip()

        # the 'user description' is in the beginning. extract and return it
        possible_headers = self._possible_headers()
        start_position = description_lowercase.find(user_description_header) + len(user_description_header)
        end_position = len(description)
        for header in possible_headers: # try to clip at the next header
            if header != user_description_header and header in description_lowercase:
                end_position = min(end_position, description_lowercase.find(header))
        if end_position != len(description) and end_position > start_position:
            original_user_description = description[start_position:end_position].strip()
            if original_user_description.endswith("___"):
                original_user_description = original_user_description[:-3].strip()
        else:
            original_user_description = description.split("___")[0].strip()
            if original_user_description.lower().startswith(user_description_header):
                original_user_description = original_user_description[len(user_description_header):].strip()

        get_logger().info(f"Extracted user description from existing description",
                          description=original_user_description)
        self.user_description = original_user_description
        return original_user_description

    def _possible_headers(self):
        return ("### **user description**", "### **pr type**", "### **pr description**", "### **pr labels**", "### **type**", "### **description**",
                "### **labels**", "### 🤖 generated by pr agent")

    def _is_generated_by_pr_agent(self, description_lowercase: str) -> bool:
        possible_headers = self._possible_headers()
        return any(description_lowercase.startswith(header) for header in possible_headers)

    @abstractmethod
    def get_repo_settings(self):
        pass

    def get_pr_id(self):
        return ""

    def get_line_link(self, relevant_file: str, relevant_line_start: int, relevant_line_end: int = None) -> str:
        return ""

    #### comments operations ####
    @abstractmethod
    def publish_comment(self, pr_comment: str, is_temporary: bool = False):
        pass

    def publish_persistent_comment(self, pr_comment: str,
                                   initial_header: str,
                                   update_header: bool = True,
                                   name='review',
                                   final_update_message=True):
        self.publish_comment(pr_comment)

    @abstractmethod
    def publish_inline_comment(self, body: str, relevant_file: str, relevant_line_in_file: str):
        pass

    def create_inline_comment(self, body: str, relevant_file: str, relevant_line_in_file: str,
                              absolute_position: int = None):
        raise NotImplementedError("This git provider does not support creating inline comments yet")

    @abstractmethod
    def publish_inline_comments(self, comments: list[dict]):
        pass

    @abstractmethod
    def remove_initial_comment(self):
        pass

    @abstractmethod
    def remove_comment(self, comment):
        pass

    @abstractmethod
    def get_issue_comments(self):
        pass

    def get_comment_url(self, comment) -> str:
        return ""

    #### labels operations ####
    @abstractmethod
    def publish_labels(self, labels):
        pass

    @abstractmethod
    def get_pr_labels(self, update=False):
        pass

    def get_repo_labels(self):
        pass

    @abstractmethod
    def add_eyes_reaction(self, issue_comment_id: int, disable_eyes: bool = False) -> Optional[int]:
        pass

    @abstractmethod
    def remove_reaction(self, issue_comment_id: int, reaction_id: int) -> bool:
        pass

    #### commits operations ####
    @abstractmethod
    def get_commit_messages(self):
        pass

    def get_pr_url(self) -> str:
        if hasattr(self, 'pr_url'):
            return self.pr_url
        return ""

    def get_latest_commit_url(self) -> str:
        return ""

    def auto_approve(self) -> bool:
        return False

    def calc_pr_statistics(self, pull_request_data: dict):
        return {}

    def get_num_of_files(self):
        try:
            return len(self.get_diff_files())
        except Exception as e:
            return -1


def get_main_pr_language(languages, files) -> str:
    """
    Get the main language of the commit. Return an empty string if cannot determine.
    """
    main_language_str = ""
    if not languages:
        get_logger().info("No languages detected")
        return main_language_str
    if not files:
        get_logger().info("No files in diff")
        return main_language_str

    try:
        top_language = max(languages, key=languages.get).lower()

        # validate that the specific commit uses the main language
        extension_list = []
        for file in files:
            if not file:
                continue
            if isinstance(file, str):
                file = FilePatchInfo(base_file=None, head_file=None, patch=None, filename=file)
            extension_list.append(file.filename.rsplit('.')[-1])

        # get the most common extension
        most_common_extension = '.' + max(set(extension_list), key=extension_list.count)
        try:
            language_extension_map_org = get_settings().language_extension_map_org
            language_extension_map = {k.lower(): v for k, v in language_extension_map_org.items()}

            if top_language in language_extension_map and most_common_extension in language_extension_map[top_language]:
                main_language_str = top_language
            else:
                for language, extensions in language_extension_map.items():
                    if most_common_extension in extensions:
                        main_language_str = language
                        break
        except Exception as e:
            get_logger().exception(f"Failed to get main language: {e}")
            pass

        ## old approach:
        # most_common_extension = max(set(extension_list), key=extension_list.count)
        # if most_common_extension == 'py' and top_language == 'python' or \
        #         most_common_extension == 'js' and top_language == 'javascript' or \
        #         most_common_extension == 'ts' and top_language == 'typescript' or \
        #         most_common_extension == 'tsx' and top_language == 'typescript' or \
        #         most_common_extension == 'go' and top_language == 'go' or \
        #         most_common_extension == 'java' and top_language == 'java' or \
        #         most_common_extension == 'c' and top_language == 'c' or \
        #         most_common_extension == 'cpp' and top_language == 'c++' or \
        #         most_common_extension == 'cs' and top_language == 'c#' or \
        #         most_common_extension == 'swift' and top_language == 'swift' or \
        #         most_common_extension == 'php' and top_language == 'php' or \
        #         most_common_extension == 'rb' and top_language == 'ruby' or \
        #         most_common_extension == 'rs' and top_language == 'rust' or \
        #         most_common_extension == 'scala' and top_language == 'scala' or \
        #         most_common_extension == 'kt' and top_language == 'kotlin' or \
        #         most_common_extension == 'pl' and top_language == 'perl' or \
        #         most_common_extension == top_language:
        #     main_language_str = top_language

    except Exception as e:
        get_logger().exception(e)
        pass

    return main_language_str


class IncrementalPR:
    def __init__(self, is_incremental: bool = False):
        self.is_incremental = is_incremental
        self.commits_range = None
        self.first_new_commit = None
        self.last_seen_commit = None

    @property
    def first_new_commit_sha(self):
        return None if self.first_new_commit is None else self.first_new_commit.sha

    @property
    def last_seen_commit_sha(self):
        return None if self.last_seen_commit is None else self.last_seen_commit.sha
